(IDEX Online) - A Swedish firm is selling diamond-encrusted versions of the Apple Watch 7, with a $15,000 price tag.Golden Concept says it will make a limited edition of just seven. Each watch features a special case, carved from a titanium block and set with 443 diamonds with a total weight of four carats.The company, which describes itself as an aftermarket electronic customization service, says the gems are of "exceptional" cut, clarity and color, but does not provide specifications."The Golden Concept Diamond Edition is the world's first and only Apple Watch case designed with real diamonds," says the company on its website. A regular Apple Watch 7 costs around $300.Pic courtesy Golden Concept